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Brachiopod Fossil 3D Model
As one of the dominant creatures on the sea floor during the Palaeozoic Era (~550 - 250 million years ago), brachiopods are an incredibly important fossil group. However, only a few survived the Permo-Triassic Mass Extinction, and they are now represented by just a few hundred species. Modern sea floors are instead dominated by bivalve molluscs. The easiest way to tell the difference is to check the line of symmetry: in brachipods, the line of symmetry bisects both valves and the valves themselves are asymmetrical (the pedicle valve is larger). This is different to bivalves, where the valves are (usually!) mirror images of one another.
CC Attribution-NonCommercial-NoDerivs CC Attribution-NonCommercial-NoDerivs
Author must be credited. No commercial use. Modified versions can not be distributed.more info